I kind of believe in ghosts, I'm just not sure which kind exist and which don't. I'd rather believe that poltergeists don't exist, only because of how violent I've heard they can get. But I do believe in ghosts, so poltergeists may be real as well.

No. From what I've heard, ghosts are localized and usually inhabit a specific area, like a house. It's usually called a haunting. A ghost can either be an ectoplasm recording of an event that was highly emotional, causing it to be repeated over and over again, but not an actual spirit being involved; or it can be the actual spirit of a departed person. A poltergeist is much more serious, as it involves an actual person being the focus of the ghosts' attention and not just the location. Ghosts are nothing more than spooks. Poltergeists are like stalkers, very invasive.